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Effect of Acid Deposition on Quantity and Quality of Dissolved Organic Matter in Soil-Water.

Author:
  • Sara Ekström
  • Emma Kritzberg
  • Dan B Kleja
  • Niklas Larsson
  • Anders Nilsson
  • Wilhelm Granéli
  • Bo Bergkvist
Publishing year: 2011
Language: English
Pages: 4733-4739
Publication/Series: Environmental Science & Technology
Volume: 45
Issue: 11
Document type: Journal article
Publisher: The American Chemical Society

Abstract english

The aim of this study was to explore how acid deposition may affect the concentration and quality of dissolved organic matter (DOM) in soil-water. This was done by a small-scale acidification experiment during two years where 0.5 × 0.5 m(2) plots were artificially irrigated with water with different sulfuric acid content, and soil-water was sampled using zero-tension lysimeters under the O-horizon. The DOM was characterized using absorbance, fluorescence, and size exclusion chromatography analyses. Our results showed lower mobility of DOM in the high acid treatment. At the same time, there was a significant change in the DOM quality. Soil-water in the high acid treatment exhibited DOM that was less colored, less hydrophobic, less aromatic, and of lower molecular weight, compared to the low acid treatment. This supports the hypothesis that reduction in sulfur deposition is an important driver behind the ongoing brownification of surface waters in many regions.

Keywords

  • Ecology

Other

Published
  • BECC
  • ISSN: 1520-5851
Wilhelm Granéli
E-mail: wilhelm [dot] graneli [at] biol [dot] lu [dot] se

Professor emeritus

Aquatic ecology

+46 70 279 82 34

E-D123

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